Friction draft-rigging.



Fia-3 J. F. OCONNDR. PRIGTION DRAFT RIGGING.

APPLIATION FILED MAR. 27., 1911.

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Elfilliffr rifllrtlttd PATENT lhlhll@ht JOHN F. OONNOR, OF CHICAGO, ILLINOIS, ASSIGNOR TO WILLIAM I-I. MINER, OF

CHICAGO, ILLINOIS.

FRICTION DRAFT-HIGGINS'.

'To all 107mm may concern.'

Be it known that l, JOHN F. OCoNNoR, a Acitizen of the United States, residingxin Chicago,in the county of Cook and State of Illinois, have invented a new and useful Improvement" in Friction Draft-Rigging, of `which the following is a specification.

My invention relates to improvements in friction draft rigging.

The object of my invention is to provide a friction draft 'rigging of a simple, etlicient and strong construction, composed of few Aparts and capable of being cheaply manufactured, and more particularly to provide a friction draft rigging in which the friction shoes may be made of relatively cheap i'naterial, such as ordinary white iron castings, and at the same time be free from danger of fracture or injury under the heavv shocks and blows to which the friction draft rigging is subjected in practical use.

My invention consists in the means l employ, and herein shown and described, to practically accomplishthis object or result, the same being more particularly pointed out in the claims.

In the accompanying drawing forming a part of this specification, Figure 1 is a plan view, partly in horizontal section,`of a friction dn ft rigging embodying my invention. Fig. 2 is a side elevation, partly in central, vertical', longitudinal section on line` 2-2 of Fig. 1. Fig. 3 is a cross section on line 3-3 of Fig. 1. F ig. 4 is a detail, perspective View of the connecting thimble which lits inside the friction shoes. Fig. 5 is a detail perspective view of the friction shoes and Fig. G is a plan view of one of the shoes.

VIn the drawing, 1 represents the center or draft sills of the car frame to which the stopy members or castings 2 are secured, 3 the draw-bar, 4 the draft yoke, 5, 6 the front and rear followers, 7 a longitudinally movable friction shell arranged between the followers, 8, 9 springs `long g'itudinally arranged within the friction shell and 10, 11 two sets of oppositcly arranged annular segmental wedging friction slices, each set preferably comprising three segmental wedging shoes 1Q, all preferably identical in shape or madev from the same pattern, and each provided with an annular internal scgmei'ital rib 13 to ali'ord bearing for the small short supplemental spring ifi which is interposed be tween the front set of shoes l0 and the rear Specification of Letters Patent.

Application filed March 27, 1911.

4 Patented July 22, 1913. serial No. 617,016.

set of shoes 1l.` The segmental ribs 13 on the front set of. shoes also afford bearing Ifor the flange 15 of the connecting thimble 16. And the segmental vinternal ribs 13 of the set of shoes 11 afford' a seat or bearing for the front end of the small spring 9 to react against, said small spring 9 being nested within the large 4spring .8 which reacts at its front end `against -the rear set 1l of said segmental 'wedging friction shoes. rJ'he connecting thimble or bearing 16 is hollow and furnished with an internal'flange 17 for the head Aof the connecting rod 18 to bear against. The connecting rod 18 is furnished with a threaded nut- 19 at its rear end for engagement with theI member 2O which closes the rear end of the friction shell 7 and which may, if preferred as illustrated in the drawing, be cast integral with the friction shell. The springs S, 9 thus reactl at their rear end against the friction shell and at their front ends against the friction shoes, the larger spring against the rear set of friction shoes and the smaller springalso against the rear set of friction shoes.v

f Each of the annular segmental friction shoes 12 has two inclined or wedging'faces 2l, 22; and a clearance space 23 is left be'- tween the friction shoes of each set at the larger or-base ends of the friction shoes to enable the shoes of each set to properly expand or spread apart under the wedging action of one set of shoes against. theother set. The front Vfollower 5 bears against the front ends of the front set of friction shoes and the rear follower 6 against the rear end of the friction shell. As the annular segmental friction shoes of the front setvinterfit or internest circumferentially with the annular segmental friction shoes of the rear set, and as the wedge faces 21,22 of the shoes of both sets act .eircumferentially against the annular segmental shoes of the two sets, the shoes are each and all subjected only to crushing strains andare not subjected at all tobreaking strains, and consequently are adapted to be made of relatively cheaper and more fragile material, such ordinary white iron castings without liabilshoes.

face. This gives true and perfect contactv Each ofthe wedge faces 21, 22 of each of the friction shoes'12 ofboth sets is prefer ably a spirally twisted wedge face instead of a straight or true plane. That is to say, each Wedge face is radial of the friction shell at all points of the length of the Wedge between`the Wedge faces cf adjacent shoes throughout the .length of the wedge faces. This will be readily understood from Figs. 3 and '6 of the drawing. The radial or spirally twisted'wedge faces 21, 22 of the friction shoes also aid,when the shoes are in engagement with each other andwith the friction shell, in maintaining the shoes always in lproper posi-tion and alinementin respect to each other and parallel to the longitudinal axis of thefriction shell and to each other.

I claim:-. 1. In a friction draft rigging, the combinat-ion with the draw-bar, draft yoke, stop members and followers, of a longitudinally movable friction shell, springs within 'the shell, one nested Within the other, front and rear sets of annular segmental wedging friction shoes, the shoes of each set being furnished with internal'shoulders, a supplemental spring interposed between the in-' ternal shoulders ofthe two sets of shoes, a

connecting thimble bearing against the shoulders of .the front set of shoesand a con-v necting rod for `said thimble and friction shell, substantially as specified.

2. In 'a friction draft ri ging, the combination with a longitudine ly movable friction shell, a spring and two sets of oppositely arranged annular segmental Wedglng friction shoes, said spring reacting at one end against the friction*- shell and at'ithe other end against one set of friction shoes.,

said shoes hay-ing internal shoulders, and a end against the friction shell an at the other end against one set'of friction shoes,

and a further spring nested Within said first spring and reacting at one end against the friction "shell and at the other end against one set of frictionshoes, and a supplemental spring reacting at one end against one set of friction shoes and at the other end against the other set of friction shoes, substantially as specified. 1

4. In a friction draft rigging, the comhiy nation with a longitudinally movable-friction shell, a spring and two sets of oppositely arranged annular segmental Wedging friction shoes, said sprlng reacting at one end against the friction shell and at the'other end against. one set of friction shoes, and a further spring nested Within said Vfirst spring and reacting at one end against the friction shell. and at the other end against one set of friction shoes, and Ia supplemental s ringreacting at one end against oneset o friction shoes and at the other end against the other set of friction Shoes, the shoes of each set having internal ribs to afford bearings for said. supplemental spring, substantially as specified.

5. In a friction draft rigging, the combination With a longitudinally movable fric-V tion shell, a spring and two sets of oppositely arranged annular segmental Wedging friction shoes, and a connecting thimble and rod for holding said parts assembled and the spring under an initial compression, substantially as specified.

' AJOHN F; oco'NNon'.

Witnesses:

PEARL ABRAMS, vESTHER MICHAELBEN.

Copies of this patent may be obtained for. ve cents each, 'by addressing the Gommissionerof Patents,

A Washingtomrnc. y 

